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https://www.olimex.com/dev/pdf/ARM/JTAG/Repair%20Procedure%20for%20OpenOcd-Rev.%20G%20drivers.pdf

Repair procedure for ARM-USB-OCD drivers

1. Uninstalling ARM-USB-OCD drivers.
1.1. Connect your programmer/debugger to your computer, open Device Manager and uninstall the drivers for ARM-USB-OCD.
1.2. After you have uninstalled ARM-USB-TINY driver from Device Manager, disconnect the programmer from your computer.
1.3. Now you should download FTClean.exe from here: http://www.ftdichip.com/Support/Utilities/FTClean.zip.
1.4. After download is complete extract the �*.zip� file, open folder FTClean,  and run FTClean.exe
1.5. Ror VID (Hex) select �Other�. And after that fill the first box with 15ba and �PID (Hex)� with 0004.
1.6. Press �Clean System� button.  Make sure that all FTDI devices are disconnected. (My require administrator privileges).

2. Re-install ARM-USB-OCD driver
2.1 Connect the programmer/debugger to the computer.
2.2 When prompted, browse to the C:\gccfd\DRIVERS\ARM-USB-OCD-DRIVER directory and install.